How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Billy Your Own Question

Billy
Billy, Trainer/Master tech.
Category: Car
Satisfied Customers: 3279
Experience:  Trainer 8+ years, master tech. 10+ years, SAE member
Type Your Car Question Here...
Billy is online now
A new question is answered every 9 seconds

Infiniti Q45t: is there someone to help me with 2000 Infiniti

Customer Question

is there someone to help me with 2000 Infiniti Q45 - 4.1l question?
Submitted: 1 year ago.
Category: Car
Expert:  Billy replied 1 year ago.
Hello and welcome! I'm Billy and i will assist you with this.

My apologies for the delay, thank you for your patience.

All the problems started at the same time, this is frustrating indeed. However, let's take this step by step, and we should be able to sort them out.

As for the MAP switch solenoid, i would first check the connector if loose, and i would check the air passages (the hoses, from air side and vacuum side), make sure you have no leaks, disconnection or restriction. Having checked these, then you'll need to check continuity from the switch to the ECM (engine control module). I will include the details needed to track this and figure out whether it is a wiring problem, air hose problem, sensor problem or ECM problem (hopefully not).
click here for details

The first two codes are related obviously, as if you have a problem with the ignition signal circuit, you will get misfires. I would start by checking the resistance between terminals (3) and (2):
graphic

If you get 0 ohms then the transistor is faulty, and the coil requires replacement, if you get a resistance, then the transistor is good.

Having checked the coils, next you need to check the wiring between the ECM and the coils for continuity, for that i will include the diagram of the coils (ignition):
click here for diagram

If the coils are good, and you have continuity to the ECM, and the ECM connectors are good (i would first check those), then the ECM requires replacement.

Thank you for your trust! Get back to me if you need more assistance...Thank you in advance for the positive rating...
http://www.justanswer.com/car/expert-billy/

Regards, Billy
Billy, Trainer/Master tech.
Category: Car
Satisfied Customers: 3279
Experience: Trainer 8+ years, master tech. 10+ years, SAE member
Billy and 12 other Car Specialists are ready to help you
Customer: replied 12 months ago.

Appreciate your answer, yesterday was unable to wait 2 to 4 hrs.


I will do what you suggested and will contact you. It will take time as I have lots to check.


Keep u posted.

Expert:  Billy replied 12 months ago.
Hello,

My apologies for the inconvenience... take the time you need, and get back to me with the results, or if further assistance is needed.

Regards, Billy
Customer: replied 12 months ago.

Thanks Billy.


 


Where is ECM located? Thanks

Customer: replied 12 months ago.

I posted this question yesterday and no replies i have seen. Repeating the question on the same car.


 


Thanks Billy.


 


Where is ECM located? Thanks

Expert:  Billy replied 12 months ago.
Hello,

My apologies for the inconvenience, there must have been a fault with the system, as i did not get notified.

The ECM (engine control module), is in the passenger side foot well under the dash:

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here
View Full Image

Attachments are only available to registered users.

Register Here


Regards, Billy
Customer: replied 12 months ago.

Thank you again.


 


One last question. Where is location of ECM relay.


 


One good thing came out was that the MAP/BARO solenoid valve had a broken tube and vacuum line disconnected. Got one from Dealer.

Expert:  Billy replied 12 months ago.
You're most welcome!
The ECM relay, is just above the ECM itself:

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here
View Full Image

Attachments are only available to registered users.

Register Here


Regards,
Billy
Customer: replied 12 months ago.

Hi Billy,


 


Got the MAP/BARO solenoid installed and hooked vacuum lines and put it back together. Ran beautiful for half hour and the only code came was of multiple cylinder misfire. Waited sometime again ran good for half hour than code pops up stating multiple misfire.


Seems like only when when it gets hot is where the problem exists.


Any suggestions.


Thanks

Expert:  Billy replied 12 months ago.
Hello,

So you still have the ignition issue... accordingly, you need to check the signal (trigger) from ecu to coils, using a scope. And if the trigger is hesitating, than the ecu (having already checked the connectors) requires replacing.
Customer: replied 12 months ago.

i don't have a scope but can multimeter be used

Expert:  Billy replied 12 months ago.
Hello,

A multimeter cannot be used to check the ignition trigger signal, i'm afraid.
It can be used to check continuity, voltage etc...

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician